1 short beep - DRAM (Dynamic Random-Access Memory) refresh failure., 2 short beep - Parity circuit failure., 3 short beep - Base 64 K RAM failure., 4 short beep - System timer failure., 5 short beep - Process failure., 6 short beep - Keyboard controller Gate A20 error., 7 short beep - Virtual mode exception error., 8 short beep - Display memory Read/Write test failure., 9 short beep - ROM BIOS checksum failure., 10 short beep - How to replace the CMOS battery., 11 short beep - Cache memory error., 1 long, 2 short beeps. - Video card memory issue., 1 long, 3 short beeps. - Conventional/Extended memory failure., 1 long, 8 short beeps. - Display/Retrace test failed., Two-tone siren - Low CPU (Central Processing Unit) fan speed, voltage level issue.,

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